It’s easy way to clean A/C evaporator in Toyota Sienna.
This method is much more effective than using a hose evaporator drain (see my earlier post http://fotoblog.pelos.pl/?p=996)
First – Remove a plastic panel on passenger side center console. Find elements marked by yellow and red arrows – here you have a direct access to A/C evaporator. Spray them with A/C cleaning spray.